Pyroxylin compound.



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JEAN BAPTISTE GERMEUIL BONNAUD, OF OSTEND, BELGIUM.

PYROXYLEN COMPOUND.

SPECIFICATION forming part of Letters Patent No. 697,790, dated April15, I902. Application filed November 11, 1901. crial No. 81,940. (Nospecimens.)

To all whom, it may concern.-

Be it known that I, JEAN BAPTISTE GER- MEUIL BONNAUD, a citizen of theFrench Republic, residing at 60 Rue Louise, Ostend, in the Kingdom ofBelgium, have invented certain new and'useful Improvements in Processesof Making Pyroxylin Compounds; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention relates to an improvement in a process of making pyroxylincompounds. It is Well known that such compounds when employed in theliquid form for coating or varnishing objects or for similar purposesbecome hard when dried; and my invention has for its object themanufacture of a pyroxylin compound which will remain flexible andwaterproof even after it has become dry and which has a surface whichmay be polished or left dull, as desired.

In carrying out my invention I dissolve nitrocellulose in any of itswell-known solvents, preferably in methylated alcohol and camphor, inthe following proportions: one gallon of alcohol, one pound of camphor,and one pound of pyroxylin or nitrocellulose. To this solution I addgum-copal dissolved in boiling castor-oil, and this is the important anddistinguishing feature of my invention. Preferably I further add sugarof lead, litharge, white copperas, and Vanillin in very smallquantities. I find that the following proportions answer well inpractice: I dissolve from two to six parts of gum-oopal in one hundredand eighty parts of boiling castor-oil and add to this solution amixture composed of from one to four parts of sugar of lead, litharge,and white copperas mixed in equal quantities. I then add from ten tothirty parts of this solution to one hundred and eighty parts of thenitrocellulose solution in which Ihave previously dissolved a very smallquantity of vanillin. The particular value of gum-copal is that itprevents the too-rapid evaporation of the constituents of the solutionof drying, since gum-copal is insoluble in cold castor-oil. The use ofvanillin is to prevent a disagreeable smell. \Vhen ordinary fabrics aretreated with a solution such as above described,there is a disagreeablesmell until the carrier has completely evaporated. The vanillin preventsthis disagreeable smell from being noticed and substitutes therefor apleasant odor.

The solution described may be employed for coating and impregnatingpaper, textile fabrics, and the like for Walls, ceiling and floorcoverings, for coating stone, Wood, marble, and for similar purposes.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent of the United States, is

1. The process of making pyroxylin compounds which consists in adding toa pyroxylin solution, a solution made by dissolving gum-copal in boilingcastor-oil.

2. The process of making pyroxylin com- I pounds which consists inadding to a solution of pyroxylin, a solution composed of gum-copaldissolved in boiling castor-oil, mixed with sugar'of lead, whitecopperas, and litharge.

3. The process of making pyroxylin compounds, which consists in addingto a pyroxylin solution, a solution composed of gum-copal dissolved inboiling Castor-oil, sugar of lead, white copperas, litharge, and a smallquantity of vanillin.

4. The process of making pyroxylin com pounds which consists indissolving nitrocel- .1 ulose in methylated alcohol and camphor, and

adding to the solution thus obtained, a solution composed of 'gum-copaldissolved in boiling castor-oil, and of sugar of lead, litharge, whitecopperas, and adding a small quantity of vanillin.

In testimony whereof I affix my signature in presence of two witnesses.

JEAN BAPTISTE GERMEUIL BONNAUD. Witnesses:

A. E. VIDAL," A. BRowNn.

